
MONOSTABLE 555 PULSE GENERATORS 159
The 555 timer family
The standard 555 timer is housed in an
8-pin
DIL package and operates
from supply rail voltages of between 4.5 V and 15 V. This, of course,
encompasses the normal range for TTL devices and thus the device is
ideally suited for use in conjunction with TTL circuitry.
The following variants of the standard 555 timer are commonly
available:
Low power (CMOS) 555 (e.g. ICM7555IPA)
This device is a CMOS version of the 555 timer which is both pin and
function compatible with its standard counterpart. By virtue of its CMOS
technology, the device operates over a somewhat wider range of supply